[Xcb] GSoC proposal questions

[Mariusz Ceier]

Peter Harris pisze:
> On Wed, Apr 1, 2009 at 8:15 PM, Zephaniah E. Hull wrote:
>> On Wed, Apr 01, 2009 at 05:16:34PM -0700, Barton C Massey wrote:
>>> We'll dig you up a mentor, so you really don't have to.
>>> Hopefully we can talk Peter into dealing with the hard part
>>> of it, i.e. the input side, and any of us can help mentor
>>> the XCB part.  I don't think you need to know any XCB
>>> internals; just be able to write protocol descriptions in it
>>> and build libraries atop it as far as I can tell.
>> Can the code generators actually handle some of the, unique aspects of
>> the input protocols?
>>
>> IIRC, when I last looked at this (about a year and a half ago) there
>> were some challenges involving how XInput and friends put things on the
>> wire.
> 
> Just off the top of my head, XInput 2 needs Generic Event support. If
> I understand correctly, XGE is going to be used for essentially all
> future extensions, so XCB is going to have to grow support for it
> sooner or later. Sooner is better, in my opinion.
> 
So the better idea would be to implement XGE before Xi2,
do you know if it is the same for any of Xkb,Xi,Xkb2 ?
I think it is for Xkb2, a not Xkb,Xi, but I'm not sure.
It seems to be a small extension ([0,[1]), so it can be good to
implement it during community bonding period, what do you think ?

> In terms of some of the other quirks, we can either improve the code
> generator, or we can punt. xcb/util is not a bad place to put
> hand-written helper functions to deal with the most unique bits.
> 
> There are already places where XCB punts (GetProperty/SetProperty
> doesn't have a way to specify the unit size of the data, and
> RANDR/Notify doesn't have a way to specify which of the union members
> is referenced, to pick two off the top of my head. The RANDR/Notify
> thing in particular doesn't look too dissimilar from the gaps in the
> current xinput.xml protocol description. With a little care, the
> solution for one could probably be applied to the other.)
Ok, so should I read RANDR protocol description too ( or an excerpt from
it, about Notify event ), or reading xrandr.xml will be sufficient ?

> 
> Peter Harris


Mariusz Ceier

[0] http://lists.freedesktop.org/archives/xorg/2008-November/040871.html
[1] http://cgit.freedesktop.org/xorg/proto/xextproto/tree/geproto.txt